Dome damper



March 31. 1925. 1,531,769

V. VOLLBRACHT DOME DAMPER Filed April 19, 1923 nienfam l l'cforVol/brackf.

Patented Mar. 31, 1925.

UNITED STATES,

VICTOR- voLLBRAcHT, or DETROIT, MICHIGAN.

DOME DAMPER,

Application filed April 19,

.7 '0 all whom it may concern Be it known that I, Vroron VOLLBRAOHT, acitizen of the United States, residing at Detroit, county of WVayne,State of Michigan, have invented a. certain new and useful Improvementin Dome Dampers; and declare the following to be a full, clear, andexact description of the same, such as will enable others skilled in theart to which it pertains to make and use the same, reference being hadto the accompanying drawings, which form a part of this specification.

This invention relates to dome dampers and the object of the inventionis to provide a simple and efficient means for opening or closing thecove of the dome damper. The dome damper is intended for use in thethroat of a chimney over a fireplace where it'is difficult to raise orlower the lid of the damper but with this construction the lid of thedamper may be opened or closed and adjusted between the open and closedposition by a crank extending from the face of the chimney. Anotherobject of the inven-' tion is to provide a means whereby the cover ofthe dome damper may be adjusted in position from the exterior of thefireplace. A further object of the invention is to pro vide a device ofthe character described which is composed of few parts and is ofconsequent cheap construction. These objects and the several novelfeatures of the invention are hereinafter more fully 'described andclaimed and the preferred form of construction by which these objectsare attained is shown in the accompanying drawings in which- Fig. 1 is aperspective view of a dome damper showing my improved regulatingmechanism mounted therein.

Fig. 2 is a section through the dome damper.

As shown in Fig. 1 the dome damper is provided with a flange 1. which isadapted to be secured in the brick work of a chimney with which it is tobe used. Formed integrally with the flange 1 is a rectangular frame 2forming a throat through which the smoke and fumes may pass upwardlythrough the chimney. The frame 2 is provided with apertured lugs 3 and 4in which a pair of pins 5 and '6 are rotat-ably mounted. These pins 5and 6 are secured to the cover 7 for the dome damper and provide pivotsfor the said cover. A shaft 8 is journaled in the sides of the frame 2and is provided 1923. Serial No; 833,041.

with a crank 9' on the end thereof for rotion in the chimney with theshaft 8 ex tending through the facing thereof. The crank 9 is thensecured to the extending end of the shaft 8 and by rotating the crankthe cam 10 is rotated in the direction of the arrow shown in Fig. 1,which due to its en- A cam 10 is secured to the shaftv gageme-nt withthe lug 13 raises the cover 7 of the dome damper. The periphery of thecam 0r eccentric 10 is provided with rounded notches or corrugations 12which are engaged by the lug 13 in passing thereover and the lug 13 isadapted to rest in one of thenotches when the cover 7 is opened to anyparticular adjustment. When the cam is given a. half turn from theposition shown in Fig. 1 the cover 7 is in the closed position and thelug 13 is positioned over the low portion 1 1 of the cam 10. With this 1construction by turning the crank 9 the lid 7 may be readily opened orclosed or secured at any point between the open and the closedpositions.

From the foregoing description it becomes evident that the device isvery simple and efficient in operation, will not easily get out oforder, is composed of few parts and is of consequent low manufacturingcost and provides a device which accomplishes the objects described.

Having thus fully described my invention, its utility and mode ofoperation, what I claim and desire to secure by Letters Pat-.

entof the United States is 1. A dome damper comprising a frame providinga throat, a damper hinged to the frame and closing the throat, a lugformed integrally with the damper, a shaft journaled in the sides of theframe, a crankfor rotating the shaft, and a cam secured to the shaftwithin the throat, the periphery of the cam being provided withcorrugations in which the said lug is adapted to engage.

2. A dome damper comprising a frame providing a throat, a damper hingedto the frame and closing the throat, a lug on the said damper, a shaftjournaledin the sides of the frame, a crank for rotating the shaft, anda cam secured to the shaft and having a notched face engaging the lug ofthe damp er at the periphery.

3. A dome damper comprising a frame having a damper hinged to one sideof the frame and adapted to be raised or lowered to open or close thethroat, a shaft mounted in the frame extending across the throat, an

said eccentric being notched or corrugated to an extent sufficient toprevent accidental relative movement of the lug and cam.-

In testimony whereof, I sign this specifi- V cation.

VICTOR VOLLBRAOHT.

